3DUS	three-dimensional ultrasound
CBCT	cone beam computed tomography
CDSS	clinical decision support system
COIN	conformity index
CT	computed tomography
CTV	clinical target volume
DVH	dose volume histogram
eNAL	extended no-action limit
ERB	endorectal balloon
Gy	Gray
Gy(E)	isoeffective Gray equivalent
ICRU	international commission on radiation units and measurements
IGRT	image-guided radiotherapy
IMPT	intensity-modulated proton therapy
IMRT	intensity-modulated radiotherapy
IRS	implantable rectal spacer
LET	linear energy transfer
MV	Megavolt
NTCP	normal tissue complication probability
OAR	organ at risk
P-EBRT	proton external beam radiotherapy
PSPT	passive scattered proton therapy
PTV	planning target volume
QUANTEC	quantitative analyses of clinical normal tissue effects criteria
RBE	relative biological effectiveness
ROCOCO	radiation oncology collaborative comparison
TCP	tumor control probability
TP	treatment planning
VMAT	volumetric arc therapy
X-EBRT	photon external beam radiotherapy